Residual dispersion compensation over the S + C + L + U wavelength bands using highly birefringent octagonal photonic crystal fiber

Abstract

An octagonal photonic crystal fiber (PCF) with an elliptical shape in the center core is numerically investigated for residual dispersion compensation in the wavelength range 1460-1675 nm. The designed fiber exhibits flattened negative dispersion over the S + C + L + U wavelength bands and an average dispersion of -465.5 ps/(nm·km) with an absolute dispersion variation of 10.5 ps/(nm·km). In addition, the proposed PCF shows a high birefringence of 2.68×10(-2) at the operating wavelength 1550 nm, which meets the requirement of high birefringence. Moreover, the variation of two air holes in the first ring up to 5% ensures an average dispersion of -491.5 ps/(nm·km) with a dispersion variation of 13 ps/(nm·km), and birefringence reaches up to 3×10(-2). Furthermore, to evaluate the sensitivity of the fiber dispersion properties, ±5% variation in the optimum parameters is studied.

Modified Octagonal Photonic Crystal Fiber for Residual Dispersion Compensation over Telecommunication Bands

“…However, small air holes in the inner PCF structure make the complex design extremely difficult to fabricate, as was as well mentioned in [9]. In previous work [10], Samiul et al proposed MO-PCF with a specific core region shape exhibiting a negative dispersion of -465.5 ps/(nm•km) with an absolute dispersion variation of 10.5 ps/(nm•km) covering a 215 nm flat band. In the same year, Hasan et al [18] published a similar design as in [10], where they achieved flatness over 240 nm band with higher negative dispersion value compared to [10].…”

“…Photonic crystal fibers (PCFs) with high negative and flattened dispersion characteristics have been proposed by several groups studying residual dispersion [6][7][8][9][10], [18], [20], [21], [24]. Franco et al [6] proposed a PCF with seven defected air-holes in the core region and having a low average negative dispersion of -179 ps/(nm•km) over the S+C+L+U wavelength bands.…”

Management of residual dispersion of an optical transmission system using octagonal photonic crystal fiber

“…5,6 However, the conventional optical fiber of single mode used in long transmission system gives positive dispersion (D T ) of 12 to 22 ps nm −1 km −1 . 7 To minimize cost and loss, an RDCF should have the property of NFD T to a large extent. This dispersion hereinafter referred to as D T makes degradation in the optical pulse signal in the fiber-based network for the multiplexing wavelength division.…”

“…The hybrid structures of Refs. 5,7,6,17 That is why, in this paper, we propose a simple octagonal (O) PCF design that offers extremely high NFD T and dispersion variation (ΔD) of −ð708 AE 10Þ ps nm −1 km −1 and a high birefringence of 0.0234 to 0.0222 for the wavelength of 1.46 to 1.67 μm (bandwidth of 210 nm). Moreover, two conventional PCFs in hexagonal structures are proposed by Franco et al 11 and Tee et al 12 with NFD T of a very low value −179 ðΔD ¼ 2.1Þ ps nm −1 km −1 between 1.48 to 1.675 μm and a high value −456 ðΔD ¼ 12Þ ps nm −1 km −1 for 1.36 to 1.69 μm wavelength bands.…”

“…5,7,15,18 For this reason, we propose a simple octagonal structure with some circular air holes. 5,7,15,18 For this reason, we propose a simple octagonal structure with some circular air holes.…”